Rotary harrow



CARTWRIGHT ROTARY HARROW Filed May 15 IN V EN TOR WITNESS ATTORNES IPatented Aug. 21, 1923.

treats JOHN A. CARTWRIGHT, CALDWELL, IDAHO.

ROTARY nannow.

JApplica'tion filed-May 15, 1920. Serial No. 381,760.

T 0 all whom it may concern:

Be it known that I, JOHN A. OARTWRIGHT, a citizen of the United States,residing at Caldwell, in the county of Canyon and State of Idaho, haveinvented a certain new and useful Improvement in Rotary Harrows, ofwhich the following is aspecification;

My invention relates to improvements in harrows, and more particularlyto rotary barrows; in which two revolving barrows, with teeth of uniformlength, operate by re volving inward, on spindles placed in the centerof each harrow, drawn and controlled by two wooden arms, one attached tothe spindle of each barrow, and connected with the draw-bar ordouble-trees by means of iron straps perforated to receive a journalpin, making'the connection with the double trees about two inches oneach'side of the center of such double-tree or draw-bar; and the objectsof my improvement are, first, an upright or vertical spindle for theharrows; second, to provide inward revolutions of the harrows, with theteeth running at uniform depths; third to reduce the friction of thespindle and the arms connecting the harrows with the draw-bar ordouble-trees; fourth, the causing of the harrows to revolve inwardly, byreason of the pressure applied to the rear of the spindles in drawingthe harrows forward, the arms being connected with the draw-bar ordouble-trees, at angles of about forty-five degrees from the center ofeach harrow; fifth, to construct a rotary harrow which will be selfcleaning, and which will efliciently cultivate and pulverize the soil ata uniform depth, and which can be readily swung to turn corners; sixth,to provide a rotary harrow having great strength and rigidity comparedwith the weight of its parts, which is simple in construction, andeconomical to manufacture; seventh, to provide inward revolutions of theharrows, without the necessity for elevating the sides of the harrows,either inwardly or outwardly, to cause the harrows to revolve; furtherobjects will appear from the detailed description illustrated in theaccompanying drawing, in which- Figure 1 is a plan of a harrow'embodyingthis invention; Fig. 2 is a rear elevation; Fig. 3 is an enlarged detailin section on the line 3-3, Fig. 1; Fig. 4 is a plan of the journalbracket shown in Fig. 3; Fig, 5 is a plan of the connections of the armsto the draw-bar or double-trees.

Similar numerals refer to similar parts throughout the several views.

The harrow comprises two 1 rotatable 7 frames, each consisting ofchannel bars 12 crossing one another. 9 These channel bars areperforated to receive the harrow teeth 13 each of which is provided witha reduced journal bracket 2', having radial arms. The

arms of the bracket are perforated and bolted to the channel barsbetween the flanges as at 6. Rising vertically from the bracket, and atright angles thereto is a spindle 1, and therefore at right angles tothe harrow.

Arranged toengage the spindle 1 is a journal mounted on a brackettadapted to engage and be secured to a coupling pole 3 by means ofbolts. Bracing the coupling pole to the spindle is an iron brace 5secured to the coup-ling pole by means of bolts. Arranged to engage thespindle below the bracket 4 is another journal mounted on a bracket 14adapted to engage and be secured to the brace 5 by means of bolts.Immedi ately above the base of the spindle, and arranged to engage thespindle is a journal mounted on a bracket 7 which is secured to the arms8 by means of bolts, being so adapted to engage the end of such armj Thebase of the spindle 1 is secured solidly to the journal bracket 2.Connecting the two frames and adapted to engage the journal brackets 4at each end is a wooden coupling pole 3. Connecting the spindles 1 withthe double trees 11 are wooden arms 8 running at angles of forty-fivedegrees from the respective spindles and arranged to attach to thedouble-trees bymeans of cotter pins 10. Adapted to engage the arms8 andattached to the double trees is a brace 9 which is perforated at the endto receive the cotter pin 10 and passes beneath the double, trees 11.This brace 9 is bolted to the arms 8.

Upon reference to'Fig. 2 it will benoted that the bearings formed in thejournals 4:, 7 and 1% are arrangedthat the spindle 1 is at right anglesto the harrow frame. This serves to keep the harrow level thereb causingall of the teeth to penetrate the soil at a uniform depth. The angles ofthe arms 8 cause the harrows to rotate inwardly when drawn forward.Since the arms 8 are pivoted to the spindles l and are also pivoted tothe cotter pinslO in the double-trees 11, corners can be readily turnedbecause of the link construction. permitting the arms to swing with theturn. This construction 1S also responsible for the inward rotation ofthe harrows.

The invention therefore accomplishes its objects. A harrow is producedwhich will rotate inwardly without unnecessary friction. 'The parts areso constructed that a rigid structure is produced. This is moreparticularly accomplished by the rigid construction of the coupling poleand the bracing at the ends of the coupling pole; the

construction of the arms and the bracingat the ends attached to thedouble-trees. The harrow teeth can be readily unmounted, cleaned andreplaced.

' It is obvious that various changes may be made'in the details of theconstruction invention. It is, therefore, understood that this inventionis not to be limited to the specific construction shown and described.

1 am aware that prior to my invention rotary harrows have been made, buthaving thus described my invention 1 claim:

In an apparatus of the class described, coacting rotative harrowdevices, a stud ris ing from the center of each harrow device, abridging member, means for coupling the bridging member to swing withoutvertical play or lateral play upon the upper end of each of said studsand operating to couple the harrow devices, an evener beam adapted toreceive drait appliances, braces connected at one end to said bridgingmember and respectively engaging the studs in spaced relation to thebridging member, and swinging a J. A. OARTWRIGHT.

Witnesses:

J. M. HENRY, C. J. THURSTON.

